Abdominal pain and diarrhea are the most common symptoms of the onset of enterocolitis, but not all abdominal pain and diarrhea are manifestations of enterocolitis. If the abdominal pain and diarrhea are short-lived and occur with severe symptoms and diet clearly related, it can be completely considered as acute enteritis and can be treated with relevant anti-inflammatory therapy, and relevant antidiarrheal therapy, antispasmodic therapy, and analgesic therapy are possible. However, for recurrent abdominal pain and diarrhea, the most common intestinal dysfunction should be considered, which is now called irritable bowel syndrome diarrhea type. For irritable bowel syndrome diarrhea, it is considered a functional disease, closely related to the body’s mental and emotional state, the intestinal environment and microbial status. Psychological counseling, easy-to-digest food and intestinal probiotics can be used to improve symptoms. Also recurrent episodes of abdominal pain and diarrhea may be a manifestation of chronic enteritis. Patients with chronic enteritis should make relevant modifications according to clinical symptoms and usual dietary habits. Finally there are some special organic structural causes of abdominal pain and diarrhea, it is indispensable to carry out relevant examinations, including gastroenterography and colonoscopy.